CN101727258A - Transparent conductive film and applications thereof - Google Patents
Transparent conductive film and applications thereof Download PDFInfo
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- CN101727258A CN101727258A CN200810171555A CN200810171555A CN101727258A CN 101727258 A CN101727258 A CN 101727258A CN 200810171555 A CN200810171555 A CN 200810171555A CN 200810171555 A CN200810171555 A CN 200810171555A CN 101727258 A CN101727258 A CN 101727258A
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Abstract
The invention relates to a transparent conductive film and application thereof, in particular to a transparent conductive film which enables the corresponding assembled touch-control panel to have favorable control sensitivity. The transparent conductive film comprises a base material layer and a conductive layer which is stacked on the base material layer. The transparent conductive film is characterized in that the conductive layer is provided with a first conductive region and a second conductive region, wherein the first conductive region comprises a top surface of the conductive layer, and the second conductive region contacts the first conductive region and is positioned between the base material layer and the first conductive region; the first conductive region comprises metals and/or conductive metallic compounds; the second conductive region comprises a second conductive macromolecular composition with a second conductive macromolecule; and the conductibility of the first conductive region is better than that of the second conductive region. The transparent conductive film enables the corresponding assembled touch-control panel to have favorable control sensitivity by using the structure, thereby solving the problems which can not be solved in the field for a long time.
Description
Technical field
The present invention relates to a kind of conducting film, particularly relate to a kind of for the nesa coating that is installed in the touch panel.The present invention relates to a touch panel that this nesa coating is installed in addition.
Background technology
As shown in Figure 1, the nesa coating 1 that is had in one touch panel is to be provided with an electro-conductive glass 2 (its material is generally tin indium oxide (ITO)) compartment of terrain, this distance between the two is normally between 50 μ m～200 μ m, and is provided with most sheets in order to the some partition (dot spacer) 3 as interlayer; 1 of this nesa coating has a substrate layer 11 and and is positioned at conductive layer 12 on this substrate layer 11.This substrate layer 11 bears the strength of pushing that stems from the user, so the corresponding position of this conductive layer 12 borrows this strength curved recessed and make its end face 121 touch this electro-conductive glass 2 and reach the state of electrical connection, makes electric current and corresponding digital signals be able to 12 transmission of conductive layer at this electro-conductive glass 2 and this nesa coating 1.It should be noted that, also can use another nesa coating to replace this electro-conductive glass 2 on the practice, and the conductive layer 12 that need make this two nesa coating when being provided with across described some partition 3 and relatively.
The operator scheme of user on touch panel comprises the moment application of force (the simple click) and two kinds of aspects of the lasting application of force (mean setting-out, for example draw or write); Wherein, the operator scheme that continues the application of force is testing the sensitivity of controlling of this touch panel especially, if it is not good to control sensitivity, perhaps, this panel still can pass through hit testing, but its setting-out test fail by, and the result that it presented will not be a complete straight line, but bits here and there irregular line segment.
It is generally acknowledged that height that a touch panel controls sensitivity whether, depends on the electric conductivity of the conductive layer 12 of its nesa coating.The electric conductivity height of ITO, use also to have as the touch panel of the nesa coating 1 of conductive layer 12 and control sensitivity preferably with ITO, it is enough to by two kinds of topmost functional tests such as setting-out and clicks, thereby make ITO become common conductive layer material at present, yet this type of nesa coating 1 does not have pliability.
If desire to make this nesa coating to have good pliability, then normally adopt the material of conducting polymer as this conductive layer 12, but but be difficult to test by setting-out with the formed touch panel of this conducting film, though obviously the conducting film of this class has been sacrificed the sensitivity of controlling of its affiliated touch panel with respect to pliability; Therefore this class has flexual nesa coating and is not used at large to be installed in the touch panel on practice.
Apparently, gradually become today of main flow at electronic product with touch panel, how to make a nesa coating after possessing a basic pliability, the touch panel that also makes subsequent group take on has the good sensitivity of controlling, and is the required technical bottleneck that overcomes in present this area really.
Summary of the invention
The applicant infers with regard to Fig. 1, just contain the having at least with regard to some flexual conducting films 1 of conducting polymer in its conductive layer, if it is in order to the top area of this conductive layer 12 of contacting with another conducting film or electro-conductive glass 2, can have than being connected with it, but abut in the zone of this substrate layer 11 higher electric conductivity is arranged, then should help electric current and digital signals more successfully to be imported into or spread out of this conductive layer 12, and make the follow-up touch panel of making have the higher sensitivity of controlling whereby; Other cooperates the pliability of this conducting film, can significantly promote the range that it is employed.So, the objective of the invention is provide a kind of make the touch panel of corresponding assembling have the nesa coating of well controlling sensitivity.
Nesa coating of the present invention comprises: a substrate layer, and a conductive layer that is stacked on this substrate layer; It is characterized in that this conductive layer has first conduction region that includes an end face of this conductive layer, and one is connected with this first conduction region and is positioned at second conduction region between this substrate layer and first conduction region; This first conduction region includes metal and/or conductive metal compound, and this second conduction region then includes second conductive polymer composition with one second conducting polymer, and the electric conductivity of this first conduction region is to be better than the second conduction region person.
Nesa coating of the present invention, this metal select from electrical conductivity greater than 1S/cm person.
Nesa coating of the present invention, this metal select from electrical conductivity greater than 100S/cm person.
Nesa coating of the present invention, this metal are selected certainly in gold, silver, copper, iron, nickel, zinc, indium, tin, antimony, magnesium, cobalt, lead, platinum, titanium, tungsten, germanium or aluminium.
Nesa coating of the present invention, this conductive metal compound select from electrical conductivity greater than 1S/cm person.
Nesa coating of the present invention, this conductive metal compound select from electrical conductivity greater than 100S/cm person.
Nesa coating of the present invention, this conductive metal compound are selected certainly in indium oxide, tin oxide, tin indium oxide, stannous oxide, antimony tin, antimony oxide zinc, or these a combination.
Nesa coating of the present invention, the electrical conductivity of this second conducting polymer is greater than 0.01S/cm.
Nesa coating of the present invention, the electrical conductivity of this second conducting polymer is greater than 0.1S/cm.
Nesa coating of the present invention, this second conducting polymer are selected from polypyrrole, polythiophene, polyaniline, poly-(-stretch benzene), poly-to styrene, polyvinyl dioxy thiophene, polystyrolsulfon acid or these a combination.
Nesa coating of the present invention, this first conduction region are a metal body or a conductive metal compound body.
Nesa coating of the present invention, metal and/or conductive metal compound in this first conduction region are the particle shape.
Nesa coating of the present invention, this first conduction region also include first conductive polymer composition with one first conducting polymer.
Nesa coating of the present invention, this first conduction region also includes at least one jut that is stretched on this end face, and it is to form by this metal and/or conductive metal compound.
Nesa coating of the present invention, the projecting height of described jut are in 5 μ m.
Nesa coating of the present invention, the described particle diameter of emboliform metal and/or conductive metal compound that is is between between 1nm～1000nm.
Nesa coating of the present invention, the described particle diameter of emboliform metal and/or conductive metal compound that is is between between 5nm～500nm.
Nesa coating of the present invention, the described particle diameter of emboliform metal and/or conductive metal compound that is is between between 10nm～100nm.
Nesa coating of the present invention, the described consumption ratio that is emboliform metal and/or the conductive metal compound and first conducting polymer is between 1/100～100.
Nesa coating of the present invention, the described consumption ratio that is emboliform metal and/or the conductive metal compound and first conducting polymer is between 1/10～50.
Nesa coating of the present invention, the thickness of this first conduction region are below 10 μ m.
Nesa coating of the present invention, the thickness of this first conduction region are below 5 μ m.
Nesa coating of the present invention, the thickness of this first conduction region are between between 1nm～4 μ m.
Nesa coating of the present invention, the thickness of this conductive layer are between between 0.01 μ m～20 μ m.
Nesa coating of the present invention, the thickness of this conductive layer are between between 0.05 μ m～10 μ m.
Nesa coating of the present invention, this second conduction region also includes a plurality of conducting particless.
Nesa coating of the present invention, this conductive layer have the following surface impedance value of 2000 Ω/.
Nesa coating of the present invention, this conductive layer have the following surface impedance value of 1500 Ω/.
Nesa coating of the present invention, this conductive layer have the following surface impedance value of 1000 Ω/.
Nesa coating of the present invention, this conductive layer have the surface impedance value between 200～800 Ω/.
Nesa coating of the present invention, the light transmittance of this nesa coating surpasses 70%.
Nesa coating of the present invention, the light transmittance of this nesa coating surpasses 75%.
Nesa coating of the present invention, the light transmittance of this nesa coating surpasses 80%.
Nesa coating of the present invention, this nesa coating also includes an at least one side that is arranged at this substrate layer, and select certainly in an extra play of the following stated: Bewildering resistance layer, anti-reflecting layer, the gas barrier layer that blocks water, antistatic layer, the flexible coating of tool, high refractive index layer, low-index layer, or their overlapping layers body.
A kind of touch panel, this touch panel is equipped with nesa coating of the present invention.
Metal in this first conduction region and/or conductive metal compound can various kenels present, and will be illustrated in down; In addition, the second included conducting polymer of this second conduction region will make nesa coating of the present invention have pliability to a certain degree.
The beneficial effect of nesa coating of the present invention is: based on above-mentioned special construction, after nesa coating of the present invention is assembled into a touch panel, this panel will present the preferable sensitivity of controlling, and this effect also the defending party to the application confirm.
Description of drawings
Fig. 1 is a synoptic diagram, and the relation that is provided with of each layer body in the existing nesa coating is described, with and be installed in user mode in the touch panel;
Fig. 2 to 4 respectively is a schematic side view, the structure that each layer body among the embodiment 1 to 3 of nesa coating of the present invention be described respectively with relation is set;
Fig. 5 to 7 respectively is a schematic side view, the structure that each layer body among the embodiment 4 to 6 of nesa coating of the present invention be described respectively with relation is set;
Fig. 8 is a synoptic diagram, and the further extended technological concept of nesa coating of the present invention is described;
Fig. 9 to 12 respectively is a schematic side view, the structure that each layer body among the embodiment 7 to 10 of nesa coating of the present invention be described respectively with relation is set;
Figure 13 is a schematic side view, the structure that each layer body among the embodiment 11 of nesa coating of the present invention be described with relation is set;
Figure 14 is a synoptic diagram, illustrates one by the shown result of the touch panel of controlling sensitivity test;
Figure 15,16 respectively is a synoptic diagram, illustrates one respectively not by the shown result of the touch panel of controlling sensitivity test.
Embodiment
Basic structure important document with regard to above-described conducting film of the present invention, now with demonstrate for example variation aspect of its structure of embodiment 1～embodiment 11, and be aided with graphic (each member to scale draw) and illustrate, and similar elements is with the similar elements symbolic representation; Simultaneously the operating conditions that can promote effect of the present invention is offered suggestions in addition, think reference.It should be noted that, below among each embodiment, the electric conductivity of its first conduction region all is better than its second conduction region; Also mean " nesa coating " and hereinafter, abbreviate " conducting film " person as.
Consult Fig. 2, the embodiment 1 of conducting film of the present invention comprises a substrate layer 4, an and conductive layer 5 that is stacked in this substrate layer 4, this conductive layer 5 has first conduction region 51 that includes an end face 511 of this conductive layer 5, and second conduction region 52 that is connected and is positioned at 51 of this substrate layer 4 and first conduction regions with this first conduction region 51; This second conduction region 52 is to disperse or dissolve solution institute's dry solidification of one second conductive polymer composition and form by one, 51 of this first conduction regions are a metal body or a conductive metal compound body, and it is via dry type coating methods such as for example sputter, vacuum evaporation, pulsed laser evaporations and be provided with.
Consult Fig. 3, the similar of the embodiment 2 of conducting film of the present invention is in the foregoing description 1, right its difference place is, metal and/or conductive metal compound that first conduction region 51 of embodiment 2 is comprised are to be the kenel of assembling with most nano particle 512 on particle shape ground to be arranged on this second conduction region 52 and to form a film body that has an even surface; Second conduction region 52 of embodiment 2 can be coated on the surface of this second conduction region 52 by an above-mentioned nanoparticle dispersion liquid, treats that its dry back forms.
Consult Fig. 4, the similar of the embodiment 3 of conducting film of the present invention is in the foregoing description 1, and so its difference place is this first conduction region 51; First conduction region 51 of embodiment 3 is except its material is the nano particle 512 of this metal and/or conductive metal compound, also include one first conductive polymer composition, it has one first conducting polymer and can more secure the above nano particle 512, and makes this first conduction region 51 have the film forming better than embodiment.The set-up mode of first conduction region 51 is to make a solution that disperses or dissolves this first conductive polymer composition and this nano particle 512 among the embodiment 3, coats on the surface of this second conduction region 52 and treats that its dry back forms.
Can further be mixed with conducting particles 521 in second conduction region 52 in the foregoing description 1～3, and derive the structure kenel (correlative type is please consulted Fig. 5,6,7 respectively) of embodiment 4,5,6 respectively; Mixing of this conducting particles 521 is in order to promote the electric conductivity of this second conduction region 52.The applicant is the nano particle 512 of this metal and/or conductive metal compound for every suggestion of this conducting particles 521 as its material described in the embodiment 2,3, in after will narrate in the lump.
Other consults Fig. 8, the applicant thinks further, except considering that the poorly conductive of this first conduction region 51 and second conduction region 52 is unusual in the conducting film, if can form as shown in Figure 8 jut 513 by metal in this first conduction region 51 and/or conductive metal compound, then along with user's the application of force, not only make conducting film of the present invention and this electro-conductive glass or another conducting film 2 can reach status of electrically connecting with delivered current and digital signals, and also can be have reached contact more closely when user's application of force between the two, and then promoted the sensitivity of controlling of follow-up touch panel with a less contact area by described jut 513.
Following embodiment 7～10 has jut.Consult Fig. 9, the similar of conducting film embodiment 7 of the present invention is in the embodiment 1 of Fig. 2, both include the identical substrate layer 4 and second conduction region 52, right difference place is, first conduction region 51 of embodiment 7 is to be to disperse point-like or netted (and be not restricted to must be rule state), and it is to be made of a plurality of juts 513 that formed on these second conduction region, 52 surfaces.
Consult Figure 10, the similar of conducting film embodiment 8 of the present invention is in the embodiment 7 of Fig. 9, and right difference is, this first conduction region 51 has more a body 514 between 52 of described jut 513 and this second conduction regions except most juts 513.This first conduction region 51 is to form these body 514 backs (but utilizing the practices such as dry type coating or wet type coating as its mode reference example 1～3) earlier, described jut 513 is formed on this body 514 and obtains, can be used a shade when forming described jut 513.
Consult Figure 11, the similar of conducting film embodiment 9 of the present invention is in the embodiment 2 of Fig. 3, the difference of right this two embodiment is to be, the particle size distribution of employed described nano particle 512 is wider among the embodiment 9, so when their are assembled and after forming a film body as embodiment 2 ground, its surface is to be the non-flat forms shape, and relatively most juts 513 also just form naturally, and obtains the conducting film of geometry aspect as shown in figure 11.
Other it should be noted that when the concentration of employed nanoparticle dispersion liquid among the embodiment 2 was hanged down, each nano particle 512 of coating on this second conduction region 52 will be dispersed, thereby individually forms a jut 513.
Consult Figure 12, the structure of conducting film embodiment 10 of the present invention and preparation method all are similar to the embodiment 3 of Fig. 4, right its difference place is, 10 solution (it has dispersed or dissolved this first conductive polymer composition and has been dispersed with this nano particle 512) of embodiment in order to prepare its first conduction region 51, with respect to 3 users of embodiment, be to have higher nano particle amount, and make the end face 511 of this first conduction region 51 will can be docile and obedient the surface formation of described nano particle 512 more, thereby being the non-flat forms shape, described jut 513 also just relatively forms.In addition described jut 513 is except being that described jut 513 also may have more first conductive polymer composition that envelopes described particle 512 after single nano particle 512 by metal and/or conductive metal compound was formed.
In second conduction region 52 of the foregoing description 7～10, also can be as more being mixed with conducting particles 521, relevant details and graphic not repeating them here as the embodiment 4～6.
Other it should be noted that, one substrate also can be according to common operator scheme on the present practice, be subjected to some surface treatment earlier (for example on the surface of at least one side of this substrate, form an extra play 6 earlier, it can be hard conating, one Bewildering resistance layer, one anti-reflecting layer, one gas barrier layer that blocks water, one antistatic layer, the flexible coating of one tool, one high refractive index layer, one low-index layer, or their overlapping layers body) after, form this conductive layer 5 again, and the structure of acquisition conducting film embodiment 11 of the present invention as shown in Figure 13, it also includes two extra plays 6 that press from both sides this substrate layer 4 of pulling except this substrate layer 4 and conductive layer 5; Relevant preparation manipulation details is known by industry, does not repeat them here.
Relevant for character, the structure of conducting film of the present invention, with other related advisorys of various materials, outline as followsly now, but described suggestion not should be restriction of the present invention; Moreover other dependency structures or preparation details all are to be familiar with its demand of personage Ke Yi of this area and to assess voluntarily, do not repeat them here.
And the also not restriction to some extent of this substrate layer 4, generally the material as the substrate layer of nesa coating all is spendable, polyimide (polyimide for example, PI), polycarbonate (polycarbonate, PC), polyethylene terephthalate (polyethyleneterephthalate, PET), Polyethylene Naphthalate (po lyethylenenaphthalate, PEN), polymethylmethacrylate (polymethyl methacrylate, PMMA), polyacrylate (polyacrylate), " if pliability " and un-desired effect, then also can adopt glass on the practice is the material of substrate layer 4; Its thickness is also unrestricted, but if emphasizes to be that flexual material, its common substrate layer 4 thickness ranges are 25 μ m～300 μ m.In each experimental example of model shown below, employed is pet substrate, and its thickness is 188 μ m, and light transmittance then is 90%.
Aspect this conductive layer 5, except that the conductive film structure of the present invention of above Fig. 3～7,9～13 cited various aspects, also allow other with regard to the structure of conductive layer 5 and change, for example this conductive layer 5 includes the sublayer that forms in regular turn and pile up; Other is with regard to the projecting height (meaning the end points of each jut 513 and the vertical range between its root edge) of described jut 513, then suggestion is in 5 μ m, the touch panel that is assembled into to avoid is not before bearing user's application of force, described jut 513 promptly is in contact with one another with separately electro-conductive glass or conducting film 2 (as shown in Figure 8), cause signal to be judged accurately, even short circuit.
As long as because of setting out first conduction region 51 that this electric conductivity is better than this second conduction region 52 basically, just can make prepared touch panel that the more excellent sensitivity of controlling is arranged in fact, so not restriction to some extent of the thickness of this first conduction region 51 in the present invention, required electrical conductivity is decided when mainly operating on practice, and this also is familiar with this area skill person and can be affectedly bashful voluntarily; Other it should be noted that, as if the desire acquisition in the practice operation is first conduction region 51 of thinner (for example below the 10nm), then can utilize the mode of above-mentioned dry type coating to carry out, and be a thicker person (for example more than the 10nm) if desire obtains, then can utilize the mode of above-mentioned wet type coating to carry out, the thickness that right wet type is coated with formed first conduction region 51 is limited by employed particle diameter size.The thickness of advising this first conduction region 51 basically is below 10 μ m, perhaps below the 5 μ m.In each experimental example of model shown below, the thickness of its conduction region 51 is between between 1nm～4 μ m.
For the light transmittance of taking conducting film of the present invention into account (should avoid being lower than 70% basically, suggestion is preferably and surpasses 75% in addition, more preferably be to surpass 80%), so that the touch panel of being installed out is when the time comes presented clear and bright picture, help the user and browse, though do not limited with regard to the thickness of this conductive layer 5 basically, right suggestion is preferably between between 0.01 μ m～20 μ m, being preferably again between between 0.05 μ m～10 μ m, more preferably is between between 0.1 μ m～5 μ m.
Above-mentioned material is nano particle 512, the conducting particles 521 of metal and/or conductive metal compound, and its particle diameter is preferably between between 1nm～1000nm, be preferably again between between 5nm～500nm, and more preferably be between between 10nm～100nm.
In conducting film of the present invention, the metal and/or the conductive metal compound material that are contained respectively in this first conduction region 51 and second conduction region 52 are to select for use electrical conductivity greater than 1S/cm, or even greater than 100S/cm person, and allow unlike material is used with; Wherein, metal can for example be selected certainly in gold, silver, copper, iron, nickel, zinc, indium, tin, antimony, magnesium, cobalt, lead, platinum, titanium, tungsten, germanium, or aluminium or the like, the conductive metal compound then can be selected certainly in indium oxide (In
2O
3, its electrical conductivity is 10
4S/m), tin oxide (SnO
2, its electrical conductivity is 1.3 * 10
3S/m), (its electrical conductivity is 10 to ITO
4～10
5S/m), (ZnO, its electrical conductivity is 2 * 10 to stannous oxide
3S/m), antimony tin (Antimony Tin Oxide, ATO; Its electrical conductivity is 10
3Or antimony oxide zinc (Antimony Zinc Oxide, AZO S/m); Its electrical conductivity is 10
3S/m) or the like.In each experimental example of the present invention's demonstration, employed is ITO and/or AZO.
Should first conducting polymer and second conducting polymer, then suggestion uses the macromolecule, particularly its electrical conductivity that have the pi-electron conjugated system in its structure greater than 0.01S/cm, even greater than the conducting polymer of 0.1S/cm; For example polypyrrole (polypyrrole), polythiophene (polythiophene), polyaniline (polyaniline), poly-(-stretch benzene) (poly (p-phenylene)), poly-to styrene (poly (phenylenevinylene)), (poly (3 for the polyvinyl dioxy thiophene, 4-ethylene dioxythiophene), PEDT), polystyrolsulfon acid (polystyrene sulfonate, PSS), or these one the combination.In each experimental example of the present invention's demonstration, employed conducting polymer is the potpourri (industry is habitual with " PEDT/PSS " expression) of PEDT and PSS, and its electrical conductivity is between between 0.1～1S/cm.
Prepare this first conductive polymer composition solution or the employed solvent of the second conductive polymer composition solution, do not limit its kind in the present invention especially yet, and the two or more solvent that allow to dissolve each other are used, as long as it can disperse or dissolve selected conducting polymer, and help first, two conduction regions 51, particle 512 in 52,521 evenly disperse to get final product, isopropyl alcohol (IPA) for example, butanone (methyl ethyl ketone, MEK), methyl alcohol, ethanol, methylisobutylketone (methyl isobutyl ketone, MIBK), water, or these a combination.In the use of model shown in the following experimental example is IPA.
In this first conductive polymer composition and second conductive polymer composition, except first conducting polymer or second conducting polymer that must have, more can have various adjuvants for example shown below respectively: a usefulness is so that (for example select oneself in polyamine ethyl formate dispersion liquid (polyurethane dispersion) than the sticker of energy fluid-tight engagement between adjacent areas or layer body, polyamine dispersion liquid (polyester dispersion), polyvinyl alcohol (PVA) (polyvinyl alcohol), polyvinylidene chloride dispersion liquid (polyvinylidenchloride dispersion), silane (silane), or these a combination), one electrical conductivity elevator (is for example selected certainly in dimethyl sulfoxide (DMSO) (dimethylsulfoxide, DMSO), N-Methyl pyrrolidone (N-methylpyrrolidone, NMP), N, dinethylformamide (N, N-dimethylformamide), N, N-dimethyl acetamide (N, N-dimethylacetamide), ethylene glycol (ethylene glycol), glycerine (glycerine), sorbierite (sorbitol)), surfactant, or these a combination; Described adjuvant generally is to mix during one conductive polymer solution in preparation, and the kind of each adjuvant and consumption be that tool knows that usually the knowledgeable is complied with its experience and demand and decides in its sole discretion in this area, so do not repeat them here.In each experimental example of the present invention's demonstration, employed adjuvant is NMP, surfactant, sticker.
Other consults Fig. 3～7, with Figure 11,12, the light transmittance of the conducting film that consideration is made, basically just contain each first conduction region 51 and/or second conduction region 52 of conducting polymer and particle 512,521 among above-mentioned each figure simultaneously, suggestion makes their conducting polymer and the consumption ratio of particle 512,521, individually be between 1/100～100, or 1/10～50, or even between 1/4～25.This consumption ratio (particle whether a certain conduction region uses relative volume in its metaphor), and whether the particle diameter of selected particle 512,521 forms relevant with described jut, upward being familiar with this area knows visual its demand of the knowledgeable usually in the practice operation, do not departing under the present invention's notion of " electric conductivity of this first conduction region 51 is better than this second conduction region ", decide in each first conduction region 51 and/or second conduction region 52 the consumption ratio of conducting polymer separately and particle 512,521.
The applicant is follow-up will be with experiment confirm, and under various structural changes, formed conducting film of the present invention all can make the touch panel after the assembling have the splendid sensitivity of controlling, and reaches the effect that the present invention desires.
For making the follow-up touch panel that makes present the preferable sensitivity of controlling, even being applied to other various electronic products except touch panel widely, the applicant advises that the conductive layer 5 of nesa coating of the present invention preferably has the following surface impedance value of 2000 Ω/; Other is based on the difference of preparation condition, the surface impedance value of the conductive layer 5 of nesa coating of the present invention can reach 1500 Ω/below the, or even 1000 Ω/below the, particularly between 200 Ω/～800 Ω/, this scope is for a specification of offering in order to the nesa coating that is installed in touch panel on the present practice.
Below the embodiment and the effect of each purpose of the present invention will be described with experimental example 1～6 and comparative example 1～5.Described conducting film will use following chemicals and equipment to prepare or test, and if do not specify, then all be to carry out under the environment of normal temperature and pressure.It is noted that described experimental example is only in order to illustrating, and should not be interpreted as restriction of the invention process.
Spent material and equipment
1.PET substrate: made by Japanese TOYOBO company, model is A4300.
2. conducting polymer (PEDT/PSS) dispersion liquid: its solid content is 2%, is made by H.C.Starck company, and model is Clevios P HCV4; The electrical conductivity of this conducting polymer is 0.3S/cm.
3. the nano particle of conductive metal compound: provide by an AZO dispersion liquid, it is to be made solid content 40% by Nissan Chemical company; The particle size range of described particle is to be distributed between 15nm～100nm.
4. solvent: isopropyl alcohol, make by Acros Organics company.
5. electrical conductivity elevator: N-N-methyl-2-2-pyrrolidone N-(N-methyl-2-pyrrolidinone (NMP)), make by Acros Organics company.
6. surfactant: product are called Dynol 604, are made by Air Products company.
7. sticker: product are called Silquest A 187, are made by Momentive company.
8. line rod (No. 14, No. 4): make by RDH company.
9.ITO target: made by Japanese Mitsui company, its specification is In
2O
3-SnO
2(90-10wt%).
Dependence test
1. light transmittance: borrow KONICA MINOTA company to make, model is the instrument (Spectrophotometer) of CM-3600D, and measuring wavelength is the ratio of each conducting film of light penetration of 550nm.
2. surface impedance value: the impedometer made from Mitsubishi Chemical Laresta-EP company, and use four-point probe to measure.The surface impedance value of each experimental example and comparative example all is to meet on the present practice specification of offering in order to the nesa coating that is installed in touch panel for (between 200 Ω/～800 Ω/).
Touch panel control sensitivity test: one 15 o'clock touch panels that use AbonTouch company, nesa coating is wherein substituted each experimental example and comparative example to be measured for the present invention, dress up a touch panel and be electrically connected to a computer with actual sets; During test, the user is directly with pointer setting-out or describe on this panel, observes line segment or figure that whether this touch panel can intactly reflect this user and described afterwards on the screen of this computer.If (for example shown result of Figure 14) then is labeled as " zero ", this represents that also this panel is by controlling sensitivity test; If major part can the person of reflecting (for example shown result of Figure 15), then be labeled as " △ "; If only can by piecemeal not reflect person (for example shown result of Figure 16), then be labeled as " * ".All represent to fail by test and be labeled as " △ ", " * " person.
＜experimental example 1 〉
The preparation method of this experimental example is a conductive polymer solution (their prescription such as following table 1 are listed) that will prepare in advance, be coated on the substrate with No. 14 line rods, then accept 120 ℃, continue 5 minutes dried, and obtain a substrate layer and one second conduction region, afterwards again with the ITO sputter on this second conduction region, and form first conduction region that a thickness is 1nm, and obtain to contain the experimental example 1 of the conductive layer of this first and second conduction region; Material that should first and second conduction region, obviously the electric conductivity of this first conduction region is to be better than this second conduction region.
Table 1
| The conducting polymer dispersion liquid | Solvent | Surfactant | The electrical conductivity elevator | Sticker | Total amount | |
| Experimental example 1 | ??50wt％ | ??45wt％ | ??1wt％ | ??3wt％ | ??1wt％ | ??100wt％ |
＜experimental example 2,3 〉
With reference to the preparation method of experimental example 1 and after forming this second conduction region, then an AZO dispersion liquid is diluted to 100 times (solid content of this dispersion liquid is reduced to 0.4%) with IPA, or not diluted, and be coated on this floor surface with one No. 4 line rods, accept above-mentioned dried again, each self-forming one first conduction region is so obtain experimental example 2,3 respectively.
First conduction region of experimental example 2,3 is made of dried AZO dispersion liquid, and include most AZO particle, therefore material that should first and second conduction region, obviously in experimental example 2,3, the electric conductivity of this first conduction region is to be better than this second conduction region; Wherein, the AZO number of particles in experimental example 2 first conduction regions is obviously lacked than experimental example, and its distribution is also more sparse.
＜experimental example 4,5 〉
With reference to the preparation method of experimental example 1 and after forming this second conduction region on each comfortable substrate, then following coating fluid is coated on the surface of one second conduction region separately with one No. 4 line rods respectively, accept above-mentioned dried again, and form one first conduction region separately, so obtain experimental example 4,5 respectively; Their first conduction region makes their film forming be better than first conduction region of embodiment 2,3 based on the existence of conducting polymer.
The main difference of first and second conduction region in the experimental example 4,5 be to be also to include the AZO nano particle in this two first conduction region, so the electric conductivity of this first conduction region obviously is to be better than this second conduction region; In addition, it is a lot of that the consumption of the AZO particle in the experimental example 5 exceeds conducting polymer, and supposition should have the formation of jut.
Table 2
(* explanation: 5=50%*2%/(0.5%*40%); 0.25=50%*2%/(10%*40%))
＜experimental example 6 〉
Experimental example 6 is the operator schemes with reference to experimental example 4,5, uses the coating fluid of the experimental example 4,5 in the above-mentioned table 2 they to be formed behind one second conduction region and one first conduction region and a conducting film that obtains respectively in regular turn.Because of the AZO particle consumption ratio in the coating fluid of this experimental example 5 is higher than the coating fluid of experimental example 4, so the electric conductivity of first conduction region in the experimental example 6, obviously be to be better than this second conduction region, moreover also should have most juts to form in this first conduction region.
The thickness of first conduction region is between between 1nm～4 μ m in above-mentioned each experimental example.
＜comparative example 1 〉
Comparative example 1 conducting film is from commercially available AbonTouch 15 " touch panel on institute disassemble, it includes a substrate layer and and is stacked on this substrate layer and its material is the conductive layer of ITO.
＜comparative example 2,3 〉
Comparative example 2,3 conducting films are respectively with reference to the announcement of USP 7332107, WO/2007/037929 embodiment 1, and reach in the surface impedance value with its conductive layer under the prerequisite of present industry specification (between 200 Ω/～800 Ω/), each coats on the substrate surface with a conducting polymer dispersion liquid (PEDOT/PSS), and drying and obtaining.
＜comparative example 4,5 〉
The structure of comparative example 4,5 conducting films is to be similar to comparative example 1, right difference place is, the conductive layer of comparative example 4,5 is except as being stacked and placed in the comparative example 1 the ITO part on this substrate layer, comprise that also one is stacked and placed on this ITO part, and the conductive polymer subdivision that forms by this conducting polymer dispersion liquid (PEDOT/PSS), but comparative example 4 is employed when this dispersion liquid of coating to be No. 4 line rods, and 5 of comparative examples are to use the person No. 14.
Experimental example 1～6 is assembled into the result that a touch panel is controlled sensitivity test respectively with each conducting film of comparative example 1～5, as shown in the following Table 3:
Table 3
It seems that from the result of table 3 each experimental example all waltzs through controls sensitivity test; The comparative example aspect then has only comparative example 1, borrows the advantage of its conductive layer material (ITO) and passes through.
Experimental example 1 then is to make between its ITO part (i.e. first conduction region) and this substrate layer compared to comparative example 1, have more a conductive polymer subdivision (i.e. second conduction region), but the pliability of experimental example 1 is better than comparative example 1.Therefore, if during the ITO partial rupture of this two conducting film, 1 of comparative example can't re-use, but experimental example 1 still can be undertaken the task of transmitting signals and electric current by its conductive polymer subdivision, and can be continued use.Obviously with respect to the comparative example 1 that has now become the commercial goods main flow, experimental example 1 presents is excellent comprehensive effect more.
Other sees the conducting film of comparative example 2,3, then is each with the different PEDOT/PSS conductive polymer subdivision of a thickness directly as its conductive layer, but this two comparative example follow-up control sensitivity test, compared to comparative example 1, obviously not good; This echoed technology cognition in the past really--the electric conductivity of conductive layer should with the touch panel that is mixed with to control sensitivity relevant.
So,, more be provided with the AZO dispersion liquid (this is the aspect of each experimental example 2～5 conducting film) of a drying, or during an ITO layer (as experimental example 1), then all obtained the excellent sensitivity test result that controls when further on a conductive polymer subdivision.
Review comparative example 4,5 conducting films (their ITO part and conductive polymer subdivision, opposite with experimental example 1 just in the order), the touch panel that it is assembled respectively control sensitivity obviously not as if each experimental example.
Therefore, above-mentioned each experimental example and comparative example 2～5 all confirm the technological concept that the present patent application people is proposed--contain the layer body of conductive layer top area, have than being connected with it, but abut higher electric conductivity is arranged, can make the touch panel of being assembled that the preferable sensitivity of controlling is arranged in the zone of this base material--rationality.
Be used as the conducting film of conductive layer material merely with conducting polymer by above explanation and demonstration susceptible of proof, though its surface impedance value meets the industry specification, but can't make that really the touch panel that is assembled into has the good sensitivity of controlling, as comparative example 2,3 those shown; So when participation by metal and/or conductive metal compound, and containing when setting out the better part of its electric conductivity (i.e. this first conduction region) on the conductive polymer subdivision (i.e. this second conduction region) in a conducting film, but significantly make the touch panel that is assembled into present the excellent sensitivity (shown in each experimental example) of controlling, thereby proved the original notion of guessing of applicant " in order to this conductive layer top area that contacts with another conducting film or electro-conductive glass; there is higher electric conductivity in the zone that is against this substrate layer near need having ", solved really and improved conducting film and make the touch panel that is assembled into control the not good technical bottleneck of sensitivity with conducting polymer material.
Claims (35)
1. a nesa coating comprises: a substrate layer, and a conductive layer that is stacked on this substrate layer; It is characterized in that: this conductive layer has first conduction region that includes an end face of this conductive layer, and one is connected with this first conduction region and is positioned at second conduction region between this substrate layer and first conduction region; This first conduction region includes metal and/or conductive metal compound, and this second conduction region then includes second conductive polymer composition with one second conducting polymer, and the electric conductivity of this first conduction region is better than second conduction region.
2. nesa coating according to claim 1 is characterized in that, this metal select from electrical conductivity greater than 1S/cm person.
3. nesa coating according to claim 2 is characterized in that, this metal select from electrical conductivity greater than 100S/cm person.
4. nesa coating according to claim 3 is characterized in that, this metal is selected certainly in gold, silver, copper, iron, nickel, zinc, indium, tin, antimony, magnesium, cobalt, lead, platinum, titanium, tungsten, germanium or aluminium.
5. nesa coating according to claim 1 is characterized in that, this conductive metal compound select from electrical conductivity greater than 1S/cm person.
6. nesa coating according to claim 5 is characterized in that, this conductive metal compound select from electrical conductivity greater than 100S/cm person.
7. nesa coating according to claim 6 is characterized in that, this conductive metal compound is selected certainly in indium oxide, tin oxide, tin indium oxide, stannous oxide, antimony tin, antimony oxide zinc, or these a combination.
8. nesa coating according to claim 1 is characterized in that the electrical conductivity of this second conducting polymer is greater than 0.01S/cm.
9. nesa coating according to claim 8 is characterized in that the electrical conductivity of this second conducting polymer is greater than 0.1S/cm.
10. nesa coating according to claim 9, it is characterized in that this second conducting polymer is selected from polypyrrole, polythiophene, polyaniline, poly-(-stretch benzene), poly-to styrene, polyvinyl dioxy thiophene, polystyrolsulfon acid or these a combination.
11. nesa coating according to claim 1 is characterized in that, this first conduction region is a metal body or a conductive metal compound body.
12. nesa coating according to claim 1 is characterized in that, metal and/or conductive metal compound in this first conduction region are the particle shape.
13. nesa coating according to claim 12 is characterized in that, this first conduction region also includes first conductive polymer composition with one first conducting polymer.
14. nesa coating according to claim 1 is characterized in that, this first conduction region also includes at least one jut that is stretched on this end face, and it is to form by this metal and/or conductive metal compound.
15. nesa coating according to claim 14 is characterized in that, the projecting height of described jut is in 5 μ m.
16. nesa coating according to claim 12 is characterized in that, the described particle diameter of emboliform metal and/or conductive metal compound that is is between between 1nm～1000nm.
17. nesa coating according to claim 16 is characterized in that, the described particle diameter of emboliform metal and/or conductive metal compound that is is between between 5nm～500nm.
18. nesa coating according to claim 17 is characterized in that, the described particle diameter of emboliform metal and/or conductive metal compound that is is between between 10nm～100nm.
19. nesa coating according to claim 13 is characterized in that, the described consumption ratio that is emboliform metal and/or the conductive metal compound and first conducting polymer is between 1/100～100.
20. nesa coating according to claim 19 is characterized in that, the described consumption ratio that is emboliform metal and/or the conductive metal compound and first conducting polymer is between 1/10～50.
21. nesa coating according to claim 1 is characterized in that, the thickness of this first conduction region is below 10 μ m.
22. nesa coating according to claim 21 is characterized in that, the thickness of this first conduction region is below 5 μ m.
23. nesa coating according to claim 22 is characterized in that, the thickness of this first conduction region is between between 1nm～4 μ m.
24. nesa coating according to claim 1 is characterized in that, the thickness of this conductive layer is between between 0.01 μ m～20 μ m.
25. nesa coating according to claim 24 is characterized in that, the thickness of this conductive layer is between between 0.05 μ m～10 μ m.
26. nesa coating according to claim 1 is characterized in that, this second conduction region also includes a plurality of conducting particless.
27. nesa coating according to claim 1 is characterized in that, this conductive layer has the following surface impedance value of 2000 Ω/.
28. nesa coating according to claim 27 is characterized in that, this conductive layer has the following surface impedance value of 1500 Ω/.
29. nesa coating according to claim 28 is characterized in that, this conductive layer has the following surface impedance value of 1000 Ω/.
30. nesa coating according to claim 29 is characterized in that, this conductive layer has the surface impedance value between 200～800 Ω/.
31. nesa coating according to claim 1 is characterized in that, the light transmittance of this nesa coating surpasses 70%.
32. nesa coating according to claim 31 is characterized in that, the light transmittance of this nesa coating surpasses 75%.
33. nesa coating according to claim 32 is characterized in that, the light transmittance of this nesa coating surpasses 80%.
34. nesa coating according to claim 1, it is characterized in that, this nesa coating also includes an at least one side that is arranged at this substrate layer, and select certainly in an extra play of the following stated: Bewildering resistance layer, anti-reflecting layer, the gas barrier layer that blocks water, antistatic layer, the flexible coating of tool, high refractive index layer, low-index layer, or their overlapping layers body.
35. a touch panel is characterized in that, this touch panel is equipped with according to arbitrary described nesa coating in the claim 1～34.
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| CN200810171555A CN101727258A (en) | 2008-10-17 | 2008-10-17 | Transparent conductive film and applications thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476490A (en) * | 2010-11-23 | 2012-05-30 | 远东新世纪股份有限公司 | Method for prolonging antistatic capacity of transparent antistatic film, and transparent antistatic film |
| CN104851522A (en) * | 2015-05-21 | 2015-08-19 | 郑州大学 | Preparation method of large-area PEDOT/PSS transparent conductive film |
| CN105488450A (en) * | 2014-09-19 | 2016-04-13 | 致伸科技股份有限公司 | Sensing device |
-
2008
- 2008-10-17 CN CN200810171555A patent/CN101727258A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102476490A (en) * | 2010-11-23 | 2012-05-30 | 远东新世纪股份有限公司 | Method for prolonging antistatic capacity of transparent antistatic film, and transparent antistatic film |
| CN102476490B (en) * | 2010-11-23 | 2015-04-08 | 远东新世纪股份有限公司 | Method for prolonging antistatic capacity of transparent antistatic film, and transparent antistatic film |
| CN105488450A (en) * | 2014-09-19 | 2016-04-13 | 致伸科技股份有限公司 | Sensing device |
| CN104851522A (en) * | 2015-05-21 | 2015-08-19 | 郑州大学 | Preparation method of large-area PEDOT/PSS transparent conductive film |
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Application publication date: 20100609 |